Modification of polyetherimide membranes with ZIFs fillers for CO2 separation
Por:
Vega, J., Andrio, A., Lemus, A. A., Díaz J.A.I., del Castillo, L. F., Gavara, R., Compan, V.
Publicada:
1 abr 2019
Resumen:
Flat hybrid membranes composed of polyetherimide (PEI) as matrix and zeolitic imidazolate frameworks (ZIFs) as fillers at concentrations of 10 and 20 wt% were prepared. Apparent permeability coefficient and apparent diffusivity coefficient of gases (CO2 and N2) for these hybrid membranes (PZIFs) were determined by the “time-lag” method. The experimental conditions used were from 25 °C to 55 °C with pressures of 2, 3 and 5 bar. The PZIFs with fillers of ZIF-8 (PZ-Zn) and ZIF-67 (PZ-Co) showed apparent selectivities (aPa(CO2)/Pa(N2)) of 39.6 and 27.5, respectively, higher than the aPa(CO2)/Pa(N2) of the reference membrane PEI, while the membrane with filler of ZIF-Mix (PZ-Zn/Co) showed the lowest aPa(CO2)/Pa(N2) selectivity of 10.3 in the membrane series (under conditions of 25 °C and 2 bar). It is proposed that the selectivity of the membrane series can be attributed to two critical factors: the particle size/distribution ratio in the polymer base and sorption of CO2 at local sites of the bimetallic mixture. On the other hand, gas permeation studies (O2, CO2 and CH4, and CO2/CH4 and CO2/C2H4 mixtures), were carried out in the series of PZIFs membranes. Permeability data were obtained by an isostatic method based on a permeation cell connected in series to a gas chromatograph where the rate of permeated gases was analyzed until a stationary state was reached. The complementary characterization techniques were: scanning electron microscopy, thermogravimetric analysis, and powder X-ray diffraction, which support the existence of the amorphous/crystalline phases of the PZIFs. © 2018 Elsevier B.V.
Filiaciones:
Vega, J.:
Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Legaría, Instituto Politécnico Nacional, CDMX, Mexico
Inst Politecn Nacl, Unidad Legaria, Ctr Invest Ciencia Aplicada & Tecnol Avanzada, Mexico City, DF, Mexico
Andrio, A.:
Departamento de Física, Escuela Superior de Tecnología y Ciencias Experimentales, Universidad Jaime ICatellón 12072, Spain
Univ Jaime I, Escuela Super Tecnol & Ciencias Expt, Dept Fis, Catellon 12072, Spain
Lemus, A. A.:
Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Legaría, Instituto Politécnico Nacional, CDMX, Mexico
Inst Politecn Nacl, Unidad Legaria, Ctr Invest Ciencia Aplicada & Tecnol Avanzada, Mexico City, DF, Mexico
Díaz J.A.I.:
Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Legaría, Instituto Politécnico Nacional, CDMX, Mexico
del Castillo, L. F.:
Departamento de Polímeros, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Ciudad Universitaria, C. P. l 70-360, Coyoacán, México, DF 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Dept Polimeros, Ciudad Univ,CP 170-360, Mexico City 04510, DF, Mexico
Gavara, R.:
Food Safety and Preservation Department, IATA-CSIC, Avda. Agustin Escardino 7, 46980 Paterna, Valencia, Spain
CSIC, IATA, Food Safety & Preservat Dept, Avda Agustin Escardino 7, Valencia 46980, Spain
Compan, V.:
Departamento de Termodinámica Aplicada, ETSII, Universitat Politècnica de València, Campus de Vera s/n, Valencia, 46022, Spain
Univ Politecn Valencia, ETSII, Dept Termodinam Aplicada, Campus Vera S-N, E-46022 Valencia, Spain
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